Pushing the gas while understeering will just cause more understeer. I find with mine, a 2003
MCS with 17" Toyo Proxes 4, its best, while in the bend, to lift off and the tail jumps out to correct the understeer, then you can balance the car by modulating the throttle...
There is a track in SA called Zwartkops with a right hand 90deg bend, taken in second. Virtually every time I can get a four wheel drift or oversteer, similarly with a hairpin bend a few corners later. This is achieved by flicking the car into the bend as the gas is taken off inducing more of an oversteering entry. .....Now if you are oversteering a FWD car the worst thing to do is to back off cause then it will want to oversteer more....not like a RWD... I always drive the track with ASC off...
Sometimes trying too hard will result in understeer (Keeping the gas on while entering the bend). Another point which does not really apply to a round about is what Jackie Stewart told that guy on Top Gear. Dont get back on the throttle untill you can keep it flat until the next bend, makes for much smoother progress and easier tyre wear. If you REALLY want to get rid of the understeer, pull the handbrake up for an intstant.....and when/if you get home, replace your undies immediately...
Be careful and only try these tricks on a track....and remember the Minis brakes are not the best.